I've just started trying a top up of formula just before putting my 8 week old down at 9.30pm (usual bedtime) just to try and get her to go longer than 1 and a half hours at night as I'm knackered and am worried that my milk production is suffereing - pretty rubbish from 6pm on. I don't want to mess up my milk production though - should I try to express at this time so I don't lose milk around then? (just in case I stop doing it for any reason). I try to rest as much but get bored and need to get out of the house each day - the HV suggestion was basically not to do anything so as to improve my milk - but this will drive me mad. Any thoughts? I don't want to have to give up BF as I really enjoy it